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PART 1 GARTH: PACIFIC OXYRHYNCHA 67
Genus COLLODES Stimpson
Microrhynchus Bell, 1835a, p. 88; type: M. gibbosus Bell, by subsequent designation of Miers (1879c, p. 651) ; 1836, p. 40. Dana,
1851b, p. 427.
Neorhynchus A. Milne Edwards, 1879, p. 186 (name substituted for
Microrhynchus, preoccupied).
Collodes Stimpson, 1860b, p. 193; type: C. granosus Stimpson, by mono-
typy. A. Milne Edwards, 1878, p. 175. Miers, 1879c, p. 645. Alcock, 1895, p. 189. Rathbun, 1901, p. 55; 1925, p. 105.
Dasygyius Rathbun, 1897, p. 164 (name substituted for Neorhynchus,
preoccupied) ; 1925, p. 137.
Type: Collodes granosus Stimpson, by monotypy.
Description: Carapace ovate-triangular. Rostrum short, entire, or
bifid with the lobes approximated. Eyes of moderate length, retractile
against a large, triangular postocular process separated from supraorbital
arch by a deep, open, marginal fissure. Basal antennal article narrow,
a little curved, anteriorly bidentate, one tooth placed behind the other,
movable part long, exposed. Merus of outer maxillipeds obcordate,
broad as ischium, deeply incised on distal margin, internal angle prominent, acute. Chelipeds of moderate size. Ambulatory legs short, prehensile, dactyli slender, equal in length to propodi, and retractile against
them. Abdomen of male with six, of female with five segments. (Stimpson, as modified by Alcock and by Rathbun)
The present difficulty with respect to the two species originally
described by Bell as Microrhynchus gibbosus and M. depressus arises
not so much from the fact that they are not congeneric, as Bell supposed,
but that M. gibbosus, the species which on rediscovery allies itself with
members of the genus Collodes Stimpson, rather than Microrhynchus
depressus, the species that stands alone, was arbitrarily chosen by Miers
(1879c, p. 651) as the type of Bell's genus. Such a designation, once
made, is as binding on subsequent reviewers as if included in the original
description, according to Article 30 of the International Rules of Zoological Nomenclature, paragraphs f and g. Had Miers chosen M. depressus as type instead, it might have been possible to preserve the name
Dasygyius Rathbun as the latest in a series of substitutions for Microrhynchus Bell. Under the Rules, therefore, the present writer has no
option but to suppress Dasygyius Rathbun, 1897, in favor of the earlier
Collodes Stimpson, 1860, and to erect a new genus to accommodate
the otherwise nameless Microrhynchus depressus. A petition to the International Commission on Zoological Nomenclature for a suspension of

PART 1 GARTH: PACIFIC OXYRHYNCHA 67
Genus COLLODES Stimpson
Microrhynchus Bell, 1835a, p. 88; type: M. gibbosus Bell, by subsequent designation of Miers (1879c, p. 651) ; 1836, p. 40. Dana,
1851b, p. 427.
Neorhynchus A. Milne Edwards, 1879, p. 186 (name substituted for
Microrhynchus, preoccupied).
Collodes Stimpson, 1860b, p. 193; type: C. granosus Stimpson, by mono-
typy. A. Milne Edwards, 1878, p. 175. Miers, 1879c, p. 645. Alcock, 1895, p. 189. Rathbun, 1901, p. 55; 1925, p. 105.
Dasygyius Rathbun, 1897, p. 164 (name substituted for Neorhynchus,
preoccupied) ; 1925, p. 137.
Type: Collodes granosus Stimpson, by monotypy.
Description: Carapace ovate-triangular. Rostrum short, entire, or
bifid with the lobes approximated. Eyes of moderate length, retractile
against a large, triangular postocular process separated from supraorbital
arch by a deep, open, marginal fissure. Basal antennal article narrow,
a little curved, anteriorly bidentate, one tooth placed behind the other,
movable part long, exposed. Merus of outer maxillipeds obcordate,
broad as ischium, deeply incised on distal margin, internal angle prominent, acute. Chelipeds of moderate size. Ambulatory legs short, prehensile, dactyli slender, equal in length to propodi, and retractile against
them. Abdomen of male with six, of female with five segments. (Stimpson, as modified by Alcock and by Rathbun)
The present difficulty with respect to the two species originally
described by Bell as Microrhynchus gibbosus and M. depressus arises
not so much from the fact that they are not congeneric, as Bell supposed,
but that M. gibbosus, the species which on rediscovery allies itself with
members of the genus Collodes Stimpson, rather than Microrhynchus
depressus, the species that stands alone, was arbitrarily chosen by Miers
(1879c, p. 651) as the type of Bell's genus. Such a designation, once
made, is as binding on subsequent reviewers as if included in the original
description, according to Article 30 of the International Rules of Zoological Nomenclature, paragraphs f and g. Had Miers chosen M. depressus as type instead, it might have been possible to preserve the name
Dasygyius Rathbun as the latest in a series of substitutions for Microrhynchus Bell. Under the Rules, therefore, the present writer has no
option but to suppress Dasygyius Rathbun, 1897, in favor of the earlier
Collodes Stimpson, 1860, and to erect a new genus to accommodate
the otherwise nameless Microrhynchus depressus. A petition to the International Commission on Zoological Nomenclature for a suspension of